linux-kernel - Re: [PATCH 8/9] vfio/pci: export nvlink2 support into vendor vfio

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Date:   Thu, 11 Mar 2021 01:24:47 +1100
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Cc:     alex.williamson@...hat.com, cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, liranl@...dia.com, oren@...dia.com,
        tzahio@...dia.com, leonro@...dia.com, yarong@...dia.com,
        aviadye@...dia.com, shahafs@...dia.com, artemp@...dia.com,
        kwankhede@...dia.com, ACurrid@...dia.com, cjia@...dia.com,
        yishaih@...dia.com, mjrosato@...ux.ibm.com, hch@....de
Subject: Re: [PATCH 8/9] vfio/pci: export nvlink2 support into vendor vfio_pci
 drivers



On 11/03/2021 00:02, Jason Gunthorpe wrote:
> On Wed, Mar 10, 2021 at 02:57:57PM +0200, Max Gurtovoy wrote:
> 
>>>> +    .err_handler        = &vfio_pci_core_err_handlers,
>>>> +};
>>>> +
>>>> +#ifdef CONFIG_VFIO_PCI_DRIVER_COMPAT
>>>> +struct pci_driver *get_nvlink2gpu_vfio_pci_driver(struct pci_dev *pdev)
>>>> +{
>>>> +    if (pci_match_id(nvlink2gpu_vfio_pci_driver.id_table, pdev))
>>>> +        return &nvlink2gpu_vfio_pci_driver;
>>>
>>>
>>> Why do we need matching PCI ids here instead of looking at the FDT which
>>> will work better?
>>
>> what is FDT ? any is it better to use it instead of match_id ?
> 
> This is emulating the device_driver match for the pci_driver.


No it is not, it is a device tree info which lets to skip the linux PCI 
discovery part (the firmware does it anyway) but it tells nothing about 
which drivers to bind.


> I don't think we can combine FDT matching with pci_driver, can we?

It is a c function calling another c function, all within vfio-pci, this 
is not called by the generic pci code.



-- 
Alexey